Monoazo dye for lakes and process of making same.



few (1 "run srn'rns PATEN F E- )T'rO ERNST AND G-ILLIS GULLBRANSSON, or HooHsr-oN-TnE-mm; GER- MANY, ASSIGNORS TO FARBWERKE, VORM. MEISTER, LUCIUS & BRUNING, or HOoHsrOrtTHE- mm, GERMANY, A CORPORATION OF GERMANY.

' moncmzo ova FQR nurse AND Pnoosss or MA ING SAME.

Specification of Letters Patent.

Patented we 25,1907.

'Applicatiomfiledliaroh,2h}1907; Serial No. 364,589.

spectively citizens of the Empire of Germany and of the Kingdom of Sweden, residing at HOchst-on-the-Main, Germany, have invented certain new and useful 1m rovements in Making a Monoazo Dyestu Suitable for the Preparation of Dye-Lakes, of which the following is a specification.

Among the various azo dyestuffs suitable for the reparation of red dye lakes only very stuffs comeinto consideration as regards obtaining decidedly bluish red shades of great purity in tint and good properties of fast-ness, especially if suflicient alowance is to be madefor other'requirements of the lake-dye industry.

' ing point, 216 C.) with Z-diazomaphtha- I line-l-sulfonic acid. yields dye-lakes of spedRL yie ding similarly dyed lakes, t e beta ,oxynaphtholc acid dyestufi is distinguished the presence of 2 groups forn1inl v to lightis also very good.-

. particularly yaluable for bookand tin-Plintts' -stance,.ias follows:. 24,5 parts of sjodium b greater tin ctorial power. The fastness o the lakes to water is. absolute, in spite of salts, the

sulfonicrandcarboxylic group; t e fastness 1 lithogra'hy and ainting in oil.

he new estu'li nlay be obtained, for in- =beta naphthylaniinesulfonate 2:1 are dis It has been found thatv the monoazo dye,-' stuff from beta-Oxynaphthoic acid-2 :3 (melt- The lakes are.

solved in a little more than the equivalent proportion of sodium nitrite in the requisite quantity of water. The solution kept cool is run into cold dilute hydrochloric acld, containing somewhat more thanf2 equivalents of hydrochloric acid, so that on completion of the d-iazotation an excess of acid is still resent and nitrous acid distinctly traceable.

he dia'zo-solution thus obtained is slowly run into a solution of 20 arts of beta-oXy-. naphthoic acid 213. (ML with the-requisite quantity of water, of 25 parts of'soda-lye of 40 B' specific gravity and about 6.. arts of calcined soda' The formation of t e dyestuif is completewithin a short time. pletely separated in most cases is isolated in the usual manner and preferably em loyed in form of a paste in thepreparation o lakes; it may, hoWever;also be obtained inform of a powder as its solubility in water is'suflie cient.

We claim is 216), obtained M The red dyestuff, coma Y @2 Havingnow described our inyention, what 1. The herein described process for the,

manufacture of a monoazo dyestufi specially suitable for preparing blue-red color-lakes,

which consists in combining Z-diaZOna h-q;

thaline-l-sulfonic acid" with '2. As new pro net-the d estufilobtained1;}

by combining' diaz'onaj ht 'aline-l-sulfonic 's'o' acid with beta-oxynapht oi'c acid-2:3, being a dark red powder, of which'the. aqueous sold tion is red in concentrated sulfuric acid t e he foregoing lf i DIE-names fsubscribing' witnesses.

GULIJflRANSSON;

"Witnessem' if:

. JEAN Gavan, p CARL Gianni); 

